# SCI 275 Week 3 - DQ 1 - 8034

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## 3number

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Post your response to the following: Identify the fruit or vegetable you selected and relate the second law of thermodynamics to the changes in energy observed in Appendix C.  How did the amount of energy gained compare to the amount of energy lost as heat at the second through fourth trophic levels? Considering the amount of energy required to produce animal-based foods and goods, should humans change their habits so they consume products closer to the bottom of the food chain because it is more efficient?

 Energy Calculator Trophic level Type of producer or consumer Total energy available from previous level (100%) Energy from total gained by consumer  (10%) Energy from total lost when consumed (90%) First Primary producer 65 N/A N/A Second Primary consumer 65 6.50 58.5 Third Secondary consumer 6.5 0.65 5.85 Fourth Tertiary consumer 0.65 0.065 0.585

I chose to use a raw apple with skin to start the energy calculations. The raw, untouched apple produced 65 calories of energy. As the second law of thermodynamics states, the total amount of energy from the apple to do biological work decreased over time. The apple went from providing the first consumer with 65 calories for energy, to providing 6.5 calories of energy for the second consumer, and 0.065 calories for energy to the third consumer.

In the second through fourth trophic levels, the amount of energy lost as heat was consistently higher than the amount of energy gained.  Although the total available energy decreased significantly as the trophic levels increased, 10% of the energy available was gained by the consumer while 90% was lost as heat in each level.

Even though consuming products closer to the bottom of the food chain would be more energy efficient, I do not think we as humans should change out consumption habits. We need to consume products from all areas of the food chain to maintain a healthy diet. Although we may not be consuming as much energy from products higher in the food chain, we are getting other valuable nutrients and vitamins which are not available in the other products.

Solution Description

Post your response to the following: Identify the fruit or vegetable you selected and relate the second law of thermodynamics to the changes in energy observed in Appendix C.  How did the amount of energy gained compare to the amount of energy lost as heat at the second through fourth trophic levels? Considering the amount of energy required to produce animal-based foods and goods, should humans change their habits so they consume products closer to the bottom of the food chain because it is more efficient?

Energy Calculator

Trophic level

Type of producer or consumer

Total energy available from previous level (100%)